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    <title>async_work_group_copy</title>
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      <div xmlns="" class="refnamediv">
        <a xmlns="http://www.w3.org/1999/xhtml" id="async_work_group_copy"></a>
        <h1>async_work_group_copy</h1>
        <p>
            Perform an async copy.
        </p>
      </div>
      <div class="refsynopsisdiv">
        <h2></h2>
        <div class="funcsynopsis">
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              <td>
                <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
                    event_t
                    <strong class="fsfunc">                   
                        async_work_group_copy
                    </strong>
                (</code>
                <td>__local gentype <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*dst</var>, </td>
              </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>const __global gentype <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*src</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">size_t</a>
					 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">num_elements</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="_top">event_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">event</var><code>)</code></td>
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              <td>
                <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
                    event_t
                    <strong class="fsfunc">                   
                        async_work_group_copy
                    </strong>
                (</code>
                <td>__global gentype <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*dst</var>, </td>
              </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>const __local gentype <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*src</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">size_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">num_elements</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="_top">event_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">event</var><code>)</code></td>
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      </div>
      <div class="refsect1">
        <a id="description"></a>
        <h2>Description</h2>
        <p>
		The OpenCL C programming language implements these functions that provide asynchronous copies between global and local memory and a prefetch from global memory. 
		</p>
        <p>
		Perform an async copy of <code class="varname">num_elements</code>
<span class="type">gentype</span> elements from <code class="varname">src</code> to <code class="varname">dst</code>. The async
copy is performed by all work-items in a work-group
and this built-in function must therefore
be encountered by all work-items in a workgroup
executing the kernel with the same
argument values; otherwise the results are
undefined.
		</p>
        <p>		
Returns an event object that can be used by
<a class="citerefentry" href="wait_group_events.html"><span class="citerefentry"><span class="refentrytitle">wait_group_events</span></span></a> to wait for the async copy
to finish. The <code class="varname">event</code> argument can also be used
to associate the <code class="function">async_work_group_copy</code> with
a previous async copy allowing an event to be
shared by multiple async copies; otherwise <code class="varname">event</code>
should be zero.
		</p>
        <p>	
If <code class="varname">event</code> argument is non-zero, the event object
supplied in <code class="varname">event</code> argument will be returned.
		</p>
        <p>	
This function does not perform any implicit
synchronization of source data such as using a
barrier before performing the copy.
		</p>
      </div>
      <div class="refsect1">
        <a id="notes"></a>
        <h2>Notes</h2>
        <p>
	  Returns an event object that can be used by <a class="citerefentry" href="wait_group_events.html"><span class="citerefentry"><span class="refentrytitle">wait_group_events</span></span></a> to wait for the async copy to finish.
	  </p>
        <p>
	  The generic type name <span class="type">gentype</span> indicates the built-in data types <span class="type">char</span>,  <span class="type">char{2|4|8|16}</span>, <span class="type">uchar</span>, <span class="type">uchar{2|4|8|16}</span>, <span class="type">short</span>, <span class="type">short{2|4|8|16}</span>, <span class="type">ushort</span>, <span class="type">ushort{2|4|8|16}</span>, <span class="type">int</span>, <span class="type">int{2|4|8|16}</span>, <span class="type">uint</span>, <span class="type">uint{2|4|8|16}</span>, <span class="type">long</span>, <span class="type">long{2|4|8|16}</span>, <span class="type">ulong</span>, <span class="type">ulong{2|4|8|16}</span> or <span class="type">float</span>, <span class="type">float{2|4|8|16}</span> as the type for the arguments unless otherwise stated.
		</p>
        <p>
		If extended with <a class="citerefentry" href="cl_khr_fp64.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_fp64</span></span></a>, generic type name <span class="type">gentype</span> may indicate <span class="type">double</span> and <span class="type">double{2|4|8|16}</span> as arguments and return values. If extended with <a class="citerefentry" href="cl_khr_fp16.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_fp16</span></span></a>, generic type name <span class="type">gentype</span> may indicate <span class="type">half</span> and <span class="type">half{2|4|8|16}</span> as arguments and return values. 
		</p>
      </div>
      <div class="refsect1">
        <a id="specification"></a>
        <h2>Specification</h2>
        <p>
            <img src="pdficon_small1.gif" />
                                                 
            <a href="http://www.khronos.org/registry/cl/specs/opencl-1.0.pdf#page=201" target="OpenCL Spec">OpenCL Specification</a>
        </p>
      </div>
      <div class="refsect1">
        <a id="seealso"></a>
        <h2>Also see</h2>
        <p>
            <a class="citerefentry" href="asyncCopyFunctions.html"><span class="citerefentry"><span class="refentrytitle">Async Copy and Prefetch  Functions</span></span></a>, 
<a class="citerefentry" href="wait_group_events.html"><span class="citerefentry"><span class="refentrytitle">wait_group_events</span></span></a>
        </p>
      </div>
      <div xmlns="" class="refsect3" lang="en" xml:lang="en"><a xmlns="http://www.w3.org/1999/xhtml" id="Copyright"></a><h4 xmlns="http://www.w3.org/1999/xhtml"></h4><img xmlns="http://www.w3.org/1999/xhtml" src="KhronosLogo.jpg" /><p xmlns="http://www.w3.org/1999/xhtml"></p>Copyright © 2007-2009 The Khronos Group Inc. 
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and/or associated documentation files (the
"Materials"), to deal in the Materials without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Materials, and to
permit persons to whom the Materials are furnished to do so, subject to
the condition that this copyright notice and permission notice shall be included
in all copies or substantial portions of the Materials. 
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